JPH1147974A - Welding method - Google Patents
Welding methodInfo
- Publication number
- JPH1147974A JPH1147974A JP9207855A JP20785597A JPH1147974A JP H1147974 A JPH1147974 A JP H1147974A JP 9207855 A JP9207855 A JP 9207855A JP 20785597 A JP20785597 A JP 20785597A JP H1147974 A JPH1147974 A JP H1147974A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- temperature
- heating coil
- frequency heating
- welded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ワークの溶接時に、溶
接された直後の溶接済領域が冷却に伴う割れを発生する
ことを防止できる溶接方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method which can prevent a welded area immediately after welding from cracking due to cooling when welding a workpiece.
【０００２】[0002]
【従来の技術】従来、溶接対象とするワークを溶接した
直後、溶接済領域が高熱状態から常温にまで冷却される
途中で発生する溶接割れは、ワークを急冷することによ
って発生することが知られている。前記溶接済領域の急
冷による溶接割れは、ワークとして、例えば炭素を多く
含む材質を用いた場合に発生しやすい。2. Description of the Related Art It has been known that a weld crack generated immediately after welding a work to be welded while the welded area is being cooled from a high temperature state to a normal temperature is caused by rapidly cooling the work. ing. Weld cracks due to quenching of the welded area are likely to occur when, for example, a material containing a large amount of carbon is used as the work.
【０００３】ここで、発明協会公開技報（公技番号９２
ー２３７０２）には、軌条のレール（ワーク）の溶接後
に、ミクロ割れ、ルート割れ、表面割れなどがない高品
位で高寿命の溶接部を得るため、強制冷却用圧縮空気を
溶接に伴い発生する高熱で熱交換して１２０〜１８０°
Ｃの熱風とした後、溶接部周辺に噴射し、レール内伝熱
拡散を抑制（溶接後の冷却を制御）する軌条の溶接方法
が開示されている。[0003] Here, the Invention Technical Report (public technical number 92)
-23702), compressed air for forced cooling is generated during welding in order to obtain a high-quality, long-life weld without micro cracks, root cracks, surface cracks, etc. after welding rails (work) of rails. 120-180 ° with high heat exchange
A rail welding method is disclosed in which hot air of C is sprayed around a welded portion to suppress heat transfer diffusion in a rail (control cooling after welding).
【０００４】[0004]
【発明が解決しようとする課題】前記従来の溶接方法の
場合には、溶接時に、強制冷却用圧縮空気を熱交換し熱
風とするため、ワークの形状に合わせて取り囲むように
形成した熱交換装置を必要とし、例えば、形状を異にす
る他のワークへの適用が困難である。また、前記熱交換
装置によって熱交換された熱風を用いる方式のものは、
材質を異にするワーク毎に適用して、それらを溶接後の
冷却に適する温度に制御したり、加熱範囲（ワークの表
面より所定の深さまでの加熱）を制御したりすることが
困難である。In the case of the above-mentioned conventional welding method, a heat exchange device formed so as to surround the work according to the shape of the work in order to exchange heat with the compressed air for forced cooling into hot air during welding. For example, it is difficult to apply to other works having different shapes. Further, the method using the hot air heat exchanged by the heat exchange device,
It is difficult to apply the method to each work of different materials to control them to a temperature suitable for cooling after welding or to control a heating range (heating to a predetermined depth from the work surface). .
【０００５】本発明は、前記事情に鑑みなされたもの
で、種々の形状、材質のワークの溶接時に、溶接された
直後の溶接済領域に熱風を噴射することなく、冷却温度
を適切な温度に制御することおよび加熱範囲（ワークの
表面より所定の深さまでの加熱）を制御することを可能
とし、冷却に伴う割れを防止できる溶接方法を提供する
ことを課題とする。The present invention has been made in view of the above circumstances, and when welding workpieces of various shapes and materials, the cooling temperature is adjusted to an appropriate temperature without injecting hot air into a welded area immediately after welding. It is an object of the present invention to provide a welding method capable of controlling a heating range (heating from a surface of a work to a predetermined depth) and preventing a crack accompanying cooling.
【０００６】[0006]
【発明の解決手段】本発明の溶接方法は、ワークの溶接
時に、溶接された直後の溶接済領域を高周波加熱コイル
を用いて該ワークの溶融温度より低い温度に制御しつつ
誘導加熱することを特徴とする。A welding method according to the present invention is to perform induction heating while controlling a welded area immediately after welding to a temperature lower than the melting temperature of the work by using a high-frequency heating coil when welding the work. Features.
【０００７】[0007]
【発明の実施の形態】本発明の溶接方法は、例えば、テ
ィグ溶接、ミグ溶接、マグ溶接、シーム溶接、スポット
溶接などに適用できる。本発明の溶接方法で用いる高周
波加熱コイルは、ワークの形状、大きさ、材質などに応
じて、ワークに対しその表面より所定の深さ領域を、目
的とする温度に加熱可能に出力および周波数を制御でき
るものが用いられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The welding method of the present invention can be applied to, for example, TIG welding, MIG welding, mag welding, seam welding, spot welding, and the like. The high-frequency heating coil used in the welding method of the present invention has an output and a frequency that enable a predetermined depth region from the surface of the work to be heated to a target temperature according to the shape, size, and material of the work. What can be controlled is used.
【０００８】本発明の溶接方法において、ワークに対
し、高周波加熱コイルによりワークの溶融温度より低い
温度に制御しつつ誘導加熱する開始タイミングとして
は、溶接開始と同時、あるいは溶接開始に先立つ５秒〜
１０秒前とすることができる。溶接直後の溶接済領域と
の意味は、溶接開始時より溶接対象領域の全てを溶接し
終えるまでの間、連続して次々と形成される溶接済領域
を称す。In the welding method according to the present invention, the induction heating of the work while controlling the temperature to a temperature lower than the melting temperature of the work by the high-frequency heating coil may be performed at the same time as the start of the welding, or for 5 seconds before the start of the welding.
It can be 10 seconds ago. The term “welded area immediately after welding” refers to a welded area that is continuously formed one after another from the start of welding to the end of welding of all the welding target areas.
【０００９】高周波加熱コイルによる出力および周波数
は、連続して次々と形成される溶接済領域に対し、ワー
クの溶融温度より低い温度に制御しつつ誘導加熱できる
値が用いられるとともに、溶接対象領域を全て溶接し終
えた時点から約数秒経過するまでの間の溶接済領域に対
し、前記溶接途中に形成される溶接済領域の誘導加熱温
度より低い温度に制御しつつ誘導加熱できる値が用いら
れる。[0009] The output and frequency of the high-frequency heating coil are set to a value that allows induction heating while controlling the temperature to be lower than the melting temperature of the work for the welded areas that are continuously formed one after another. A value that can be used for induction heating while controlling to a temperature lower than the induction heating temperature of the welded region formed during the welding is used for the welded region from when all welding is completed until approximately several seconds have elapsed.
【００１０】溶接済領域とは、一般に溶接部と称される
溶接金属および熱影響部を含む。本発明の溶接方法によ
ると、ワークの溶接時に、溶接された直後の溶接済領域
が高周波加熱コイルにより誘導加熱され、かつワークの
溶融温度より低い温度に制御される。すなわち、前記溶
接された直後の溶接済領域は、誘導加熱によって割れが
発生しない冷却温度に制御される。[0010] The welded area includes a weld metal and a heat-affected zone, which are generally called welds. According to the welding method of the present invention, at the time of welding a work, the welded area immediately after welding is induction-heated by the high-frequency heating coil and is controlled to a temperature lower than the melting temperature of the work. That is, the welded area immediately after the welding is controlled to a cooling temperature at which cracking does not occur due to induction heating.
【００１１】[0011]
（実施例１）本発明、溶接方法の実施例を図１〜図４を
用いて説明する。実施例１の溶接方法を実施するに際し
て、予め、所定の位置に設置されたマグ溶接装置の溶接
トーチ１および高周波加熱コイル２と、溶接対象部材と
して鋼板を筒状に加工した円筒３および鍛造加工された
筒状体４とが用意される。(Embodiment 1) An embodiment of the present invention and a welding method will be described with reference to FIGS. In carrying out the welding method of the first embodiment, a welding torch 1 and a high-frequency heating coil 2 of a mag welding apparatus previously installed at predetermined positions, a cylinder 3 of a steel plate as a welding target member and a forging process The prepared cylindrical body 4 is prepared.
【００１２】溶接トーチ１は、ＣＯ2 にＡｒを添加した
ガス雰囲気中でアーク溶接（マグ溶接）を行う機能をも
つ。溶接トーチ１は、図２に示されるように鉛直方向か
ら水平方向に向かって４５°の傾斜角で図略の保持部材
により定位置に保持されている。高周波加熱コイル２
は、図略の電源および制御装置をもち、前記制御装置に
よって出力１０ＫＷ、周波数１ＫＨｚ〜出力７５ＫＷ、
周波数２０ＫＨｚの範囲内で種々の値に制御可能であ
る。The welding torch 1 has a function of performing arc welding (mag welding) in a gas atmosphere in which Ar is added to CO 2 . As shown in FIG. 2, the welding torch 1 is held at a fixed position by a holding member (not shown) at an inclination angle of 45 ° from the vertical direction to the horizontal direction. High frequency heating coil 2
Has an unillustrated power supply and control device, and outputs 10 KW, frequency 1 KHz to output 75 KW by the control device,
Various values can be controlled within a frequency range of 20 KHz.
【００１３】高周波加熱コイル２は、溶接トーチ１に近
接した位置で孔中心Ｏ（図１参照）を、図２の軸心線Ｐ
と一致する位置に配置され、図略の保持部材に固定され
る。円筒３は、全長Ｌが１５００ｍｍ、外径Ｄが８０ｍ
ｍ、内径ｄが７６ｍｍ、厚さｔが２ｍｍのもので、その
両端に筒状体４が対称的に挿通、装着されている（な
お、説明上、円筒３の一端３ａ側に筒状体４が挿通、装
着されている状態を図２に示す）。The high-frequency heating coil 2 moves the center O of the hole (see FIG. 1) at a position close to the welding torch 1 and the axis P of FIG.
And is fixed to a holding member (not shown). The cylinder 3 has a total length L of 1500 mm and an outer diameter D of 80 m.
m, the inner diameter d is 76 mm, and the thickness t is 2 mm, and the cylindrical body 4 is symmetrically inserted and attached to both ends thereof (for the sake of explanation, the cylindrical body 4 is attached to the one end 3a side of the cylinder 3). 2 is shown in FIG. 2).
【００１４】筒状体４は、外周側に小径部４２と大径部
４３とを備えた２段形状のもので、全長Ｌ１が８０ｍ
ｍ、内径ｄ１が８０ｍｍである。小径部４２は、長さＬ
２が４０ｍｍ、外径Ｄ１が１００ｍｍ、厚さｔ２が１０
ｍｍである。大径部４３は、長さＬ３が４０ｍｍ、外径
Ｄ２が１３０ｍｍ、厚さｔ３が２５ｍｍである。The cylindrical body 4 has a two-stage shape having a small-diameter portion 42 and a large-diameter portion 43 on the outer peripheral side, and has a total length L1 of 80 m.
m and the inner diameter d1 are 80 mm. The small diameter portion 42 has a length L
2 is 40 mm, outer diameter D1 is 100 mm, and thickness t2 is 10
mm. The large diameter portion 43 has a length L3 of 40 mm, an outer diameter D2 of 130 mm, and a thickness t3 of 25 mm.
【００１５】互いに組付けられた前記円筒３の外周部３
１と、筒状体４の小径部４２側の内周部４０との嵌合代
Ｌ４は、１０ｍｍである。円筒３と筒状体４との組付け
体５ａは、高周波加熱コイル２の孔２０内に同軸的に配
置され、かつ高周波加熱コイル２の孔内周面２１と筒状
体４の大径部４３の外周面４３０との間隔ｗが５ｍｍに
保持された状態で、図略の回動部材に軸心線Ｐを中心と
して回転可能にセットされる。なお、前記回動部材は、
円筒３の両端にそれぞれ挿通、装着された筒状体４を把
持し、組付け体５ａをワークとして予め設定された所定
の回転速度で回転制御する機能をもつ。An outer peripheral portion 3 of the cylinder 3 assembled with the cylinder 3
The fitting margin L4 between the inner peripheral part 40 of the cylindrical body 4 and the small diameter part 42 side is 10 mm. The assembled body 5a of the cylinder 3 and the cylindrical body 4 is coaxially arranged in the hole 20 of the high-frequency heating coil 2, and has a hole inner peripheral surface 21 of the high-frequency heating coil 2 and a large-diameter portion of the cylindrical body 4. In a state where the distance w between the outer peripheral surface 430 and the outer peripheral surface 430 is maintained at 5 mm, the rotating member is set to be rotatable about an axis P on a rotation member (not shown). The rotating member is
It has a function of holding the cylindrical body 4 inserted and mounted on both ends of the cylinder 3 and controlling the rotation at a predetermined rotation speed set in advance using the assembled body 5a as a work.
【００１６】次いで、実施例１の溶接方法が実施され、
溶接トーチ１による溶接開始（図４のＳ１参照）と、高
周波加熱コイル２による誘導加熱開始（図４のＫ１参
照）とが同時に行われる。溶接トーチ１による溶接は、
常温状態にある組付け体５ａ（図２参照）における円筒
３の外周面３１と筒状体４の小径部４２の端面４２１と
よりなる溶接対象領域ｅに施される。前記溶接対象領域
ｅは、断面略Ｖ字状で周方向Ｓに一周する空間を形成す
る。Next, the welding method of Example 1 is performed,
The start of welding by the welding torch 1 (see S1 in FIG. 4) and the start of induction heating by the high-frequency heating coil 2 (see K1 in FIG. 4) are performed simultaneously. Welding with welding torch 1
The welding is performed on the welding target region e formed by the outer peripheral surface 31 of the cylinder 3 and the end surface 421 of the small-diameter portion 42 of the cylindrical body 4 in the assembled body 5a (see FIG. 2) in a normal temperature state. The welding target area e forms a space having a substantially V-shaped cross section and making a round in the circumferential direction S.
【００１７】そして溶接対象領域ｅに対し、前記ガス雰
囲気中で溶接トーチ１のワイヤー電極１０との間にアー
クを発生させることにより溶接が開始される。組付け体
５ａの溶接対象部分は、アークＡによって円筒３および
筒状体４の材質の溶融点以上の温度に加熱され、かつ溶
融する。このとき、高周波加熱コイル２は、溶接トーチ
１のワイヤー電極１０と、組付け体５ａの溶接対象部分
との間にアークを発生させる溶接開始と同時に、スイッ
チがＯＮされ、組付け体５ａの溶接対象領域ｅとその周
辺部を誘導加熱する。なお、高周波加熱コイル２は、制
御装置によって出力５０ＫＷ、周波数１０ＫＨｚに制御
される。Then, welding is started by generating an arc between the welding target region e and the wire electrode 10 of the welding torch 1 in the gas atmosphere. The welding target portion of the assembled body 5a is heated by the arc A to a temperature equal to or higher than the melting point of the material of the cylinder 3 and the cylindrical body 4, and is melted. At this time, the high-frequency heating coil 2 is turned on simultaneously with the start of welding for generating an arc between the wire electrode 10 of the welding torch 1 and the portion to be welded of the assembly 5a, and the welding of the assembly 5a is started. The target area e and its surroundings are induction heated. The high-frequency heating coil 2 is controlled by the control device to have an output of 50 KW and a frequency of 10 KHz.
【００１８】従って、組付け体５ａの溶接対象領域ｅの
全体（円筒３の外周面３１と筒状体４の小径部４２の端
面４２１およびそれらから所定の深さで周方向Ｓに１周
する領域）は、高周波加熱コイル２によって誘導加熱さ
れ、かつ図４に示す温度曲線ａ１のように、常温状態の
場合から５秒後にほぼ１０００°Ｃに昇温する。ー方、
この状態で溶接トーチ１によるガス雰囲気中でのアーク
溶接が進行し、アークＡの領域内の筒３（外周面３１）
と筒状体４（小径部４２の端面４２０）とは、ほぼ１７
００°Ｃで溶融するとともに、ワイヤー電極１０が溶加
材として溶け込み、溶接金属が形成され、溶接済領域ｅ
１（図３参照）を形成するとともに、予め定められた回
転速度で周方向に新たな溶接対象となる溶接対象領域ｅ
を溶接トーチ１のワイヤー電極１０に対向させていく。
そして周方向に３６０°回転し終えて、全ての溶接対象
領域ｅが溶接済領域ｅ１となり溶接トーチ１による溶接
を終了する（図４のＳ２位置参照）。Accordingly, the entire welding target region e of the assembled body 5a (the outer peripheral surface 31 of the cylinder 3 and the end surface 421 of the small-diameter portion 42 of the cylindrical body 4 and one round in the circumferential direction S at a predetermined depth from them). 4) is induction-heated by the high-frequency heating coil 2, and as shown by a temperature curve a1 shown in FIG. -
In this state, arc welding in the gas atmosphere by the welding torch 1 proceeds, and the cylinder 3 (outer peripheral surface 31) in the area of the arc A
And the cylindrical body 4 (the end surface 420 of the small diameter portion 42) is approximately 17
While melting at 00 ° C., the wire electrode 10 melts in as a filler material to form a weld metal, and the welded region e
1 (see FIG. 3) and a new welding target area e in the circumferential direction at a predetermined rotation speed.
To the wire electrode 10 of the welding torch 1.
Then, after completing the 360 ° rotation in the circumferential direction, all the welding target areas e become the welded areas e1, and the welding by the welding torch 1 ends (see the S2 position in FIG. 4).
【００１９】このとき高周波加熱コイル２は、溶接トー
チ１による溶接の終了と同じタイミング位置（図４のＫ
２位置参照）で、加熱パラメータ（予め設定された値の
出力および周波数）を前記出力５０ＫＷ、周波数１０Ｋ
Ｈｚから直ちに、出力３０ＫＷ、周波数３ＫＨｚに変化
するように切替え制御される。この高周波加熱コイル２
により出力３０ＫＷ、周波数３ＫＨｚの加熱は、１０秒
間、継続された後、終了される（図４のＫ３位置参
照）。高周波加熱コイル２による加熱終了後は、自然放
置により図４の加熱曲線ａ１の示すように常温までに冷
却される。At this time, the high-frequency heating coil 2 is set at the same timing position as the end of welding by the welding torch 1 (K in FIG. 4).
2 position), the heating parameters (output and frequency of a preset value) are set to the output 50 KW and the frequency 10 K
The switching is controlled so that the output immediately changes from 30 Hz to 30 KW and the frequency to 3 KHz. This high frequency heating coil 2
As a result, heating with an output of 30 KW and a frequency of 3 KHz is continued for 10 seconds and then terminated (see the K3 position in FIG. 4). After the heating by the high-frequency heating coil 2 is completed, it is cooled to room temperature by a natural standing as shown by a heating curve a1 in FIG.
【００２０】前記溶接トーチ１による組付け体５ａ（図
２参照）の溶接を終了し一体化した溶接済製品５（図３
参照）は、溶接済領域ｅ１およびその周辺の温度は、１
０００°Ｃから降下するものの５００°Ｃ以上に保持さ
れた冷却状態を１０秒間継続される。前記実施例１の場
合では、溶接中における組付け体５ａに対し、高周波加
熱コイル２による誘導加熱による加熱温度の値として
は、１０００°Ｃとし、前記溶接により得られた溶接済
製品５を高周波加熱コイル２による誘導加熱により冷却
制御する場合には、１０００°Ｃ未満、５００°Ｃ以上
の加熱温度に１０秒間、保持することによって、前記高
周波加熱コイル２による誘導加熱を溶接済製品５に施さ
ない場合の急冷に較べ、緩やかに冷却されるため、溶接
済領域ｅ１での冷却に伴う割れを防止できる。The welding of the assembled body 5a (see FIG. 2) by the welding torch 1 is completed and the welded product 5 (FIG. 3) is integrated.
), The temperature of the welded area e1 and its surroundings is 1
Although the temperature drops from 000 ° C, the cooling state maintained at 500 ° C or more is continued for 10 seconds. In the case of the first embodiment, the value of the heating temperature of the assembled body 5a during the welding by the induction heating by the high-frequency heating coil 2 is set to 1000 ° C., and the welded product 5 obtained by the welding is subjected to the high-frequency heating. In the case where the cooling control is performed by induction heating by the heating coil 2, the induction heating by the high-frequency heating coil 2 is performed on the welded product 5 by maintaining the heating temperature of less than 1000 ° C. and 500 ° C. or more for 10 seconds. Since the cooling is performed more slowly than in the case where no cooling is performed, cracks due to cooling in the welded area e1 can be prevented.
【００２１】また、溶接済製品５の溶接済領域ｅ１に対
し、高周波加熱コイル２による周方向の全域に均一に誘
導加熱されるため、品質上、好ましいものとなる。 （実施例２）実施例２の溶接方法を前記図１、図２、図
３を援用するとともに、図５を用いて説明する。Further, since the induction heating is uniformly performed over the entire area in the circumferential direction by the high-frequency heating coil 2, the welded area e1 of the welded product 5 is preferable in terms of quality. (Embodiment 2) The welding method of Embodiment 2 will be described with reference to FIGS. 1, 2 and 3 and with reference to FIG.
【００２２】実施例２の溶接方法は、高周波加熱コイル
２による誘導加熱の加熱開始タイミングを、図５に示す
ように、溶接トーチ１による組付け体５ａの溶接対象領
域ｅへの溶接開始Ｓ１時点の５秒前としたこと以外は、
前記実施例１の溶接方法と同じである。実施例２の溶接
方法によると、溶接対象となるワークである組付け体５
ａは、実施例１の場合と同じように、高周波加熱コイル
２の孔２０内に同軸的にセットされる。In the welding method of the second embodiment, the heating start timing of the induction heating by the high-frequency heating coil 2 is set at the time point S1 when the welding torch 1 starts the welding of the assembled body 5a to the welding target area e by the welding torch 1, as shown in FIG. 5 seconds before
This is the same as the welding method of the first embodiment. According to the welding method of the second embodiment, the assembled body 5 that is the work to be welded is
a is set coaxially in the hole 20 of the high-frequency heating coil 2 as in the case of the first embodiment.
【００２３】ついで、高周波加熱コイル２のスイッチが
ＯＮされ、かつ誘導加熱が開始（図５の加熱開始点Ｋ１
参照）される。なお、高周波加熱コイル２は、制御装置
によって出力５０ＫＷ、周波数１０ＫＨｚに制御され
る。すると、組付け体５ａの溶接対象領域ｅは、高周波
加熱コイル２によって誘導加熱され、かつ図５に示す温
度曲線ａ２のように、常温状態の場合から５秒後にほぼ
８００°Ｃに昇温する。Next, the switch of the high-frequency heating coil 2 is turned on and the induction heating is started (the heating start point K1 in FIG. 5).
See). The high-frequency heating coil 2 is controlled by the control device to have an output of 50 KW and a frequency of 10 KHz. Then, the welding target area e of the assembled body 5a is induction-heated by the high-frequency heating coil 2 and, as shown by a temperature curve a2 shown in FIG. 5, rises in temperature to approximately 800 ° C. after 5 seconds from the normal temperature state. .
【００２４】ー方、この状態の組付け体５ａに対し、溶
接トーチ１によるガス雰囲気中でのアーク溶接が開始
（図５のＳ１参照）される。そしてアーク溶接が進行
し、アークＡの領域内の筒３（外周面３１）と筒状体４
（小径部４２の端面４２０）とは、ほぼ１７００°Ｃで
溶融するとともに、ワイヤー電極１０が溶加材として溶
け込み、溶接金属が形成され、溶接済領域ｅ１を形成す
るとともに、予め定められた回転速度で周方向Ｓに新た
な溶接対象となる溶接対象領域ｅを溶接トーチ１のワイ
ヤー電極１０に対向させていく。そして周方向に３６０
°回転し終えて、全ての溶接対象領域ｅが溶接済領域ｅ
１となり溶接トーチ１による溶接を、溶接開始（図５の
Ｓ１参照）より３０秒後に終了する（図５のＳ２参
照）。On the other hand, arc welding in the gas atmosphere by the welding torch 1 is started on the assembled body 5a in this state (see S1 in FIG. 5). Then, the arc welding proceeds, and the cylinder 3 (outer peripheral surface 31) and the cylindrical body 4 in the area of the arc A are formed.
(The end surface 420 of the small diameter portion 42) is melted at approximately 1700 ° C., the wire electrode 10 is melted as a filler material, a weld metal is formed, a welded region e1 is formed, and a predetermined rotation is performed. A welding target area e to be a new welding target in the circumferential direction S is made to face the wire electrode 10 of the welding torch 1 at a speed. And 360 in the circumferential direction
° After rotation, all the welding target areas e are welded areas e
It becomes 1 and the welding by the welding torch 1 ends 30 seconds after the start of welding (see S1 in FIG. 5) (see S2 in FIG. 5).
【００２５】このとき高周波加熱コイル２は、溶接トー
チ１による溶接の終了と同じタイミング位置（図５のＫ
２位置参照）で、加熱パラメータ（予め設定された値の
出力および周波数）を前記出力５０ＫＷ、周波数１０Ｋ
Ｈｚから直ちに、出力３０ＫＷ、周波数３ＫＨｚに変化
するように切替え制御される。この高周波加熱コイル２
により出力３０ＫＷ、周波数３ＫＨｚの加熱は、１０秒
間、継続された後、終了される（図５のＫ３位置参
照）。At this time, the high-frequency heating coil 2 is set at the same timing position as the end of welding by the welding torch 1 (K in FIG. 5).
2 position), the heating parameters (output and frequency of a preset value) are set to the output 50 KW and the frequency 10 K
The switching is controlled so that the output immediately changes from 30 Hz to 30 KW and the frequency to 3 KHz. This high frequency heating coil 2
As a result, heating with an output of 30 KW and a frequency of 3 KHz is continued for 10 seconds and then terminated (see the K3 position in FIG. 5).
【００２６】そして前記実施例１の場合と同じように、
高周波加熱コイル２による加熱終了後は、自然放置によ
り図５の加熱曲線ａ２の示すように常温までに冷却され
る。前記溶接トーチ１による組付け体５ａ（図２参照）
の溶接を終了し一体化した溶接済製品５（図３参照）
は、溶接済領域ｅ１およびその周辺の温度は、１０００
°Ｃから降下するものの５００°Ｃ以上に保持された冷
却状態を１０秒間継続される。Then, as in the case of the first embodiment,
After the heating by the high-frequency heating coil 2 is completed, it is cooled to room temperature by a natural standing as shown by a heating curve a2 in FIG. Assembled body 5a using welding torch 1 (see FIG. 2)
Welded product 5 that has been welded and integrated (see Fig. 3)
Is that the temperature of the welded area e1 and its surroundings is 1000
The cooling state, which drops from ° C but is maintained at 500 ° C or higher, is continued for 10 seconds.
【００２７】前記実施例２の場合では、溶接中における
組付け体５ａに対し、高周波加熱コイル２による誘導加
熱による加熱温度の値としては、１０００°Ｃとし、前
記溶接により得られた溶接済製品５を高周波加熱コイル
２による誘導加熱により冷却制御する場合には、１００
０°Ｃ未満、５００°Ｃ以上の加熱温度に１０秒間、保
持することによって、前記高周波加熱コイル２による誘
導加熱を溶接済製品５に施さない場合の急冷に較べ、緩
やかに冷却されるため、溶接済領域ｅ１での冷却に伴う
割れを防止できる。In the case of the second embodiment, the value of the heating temperature of the assembled body 5a during the induction heating by the high-frequency heating coil 2 is set to 1000 ° C., and the welded product obtained by the welding is obtained. 5 is controlled by induction heating by the high-frequency heating coil 2, 100
By holding at a heating temperature of less than 0 ° C. and a heating temperature of 500 ° C. or more for 10 seconds, as compared with quenching when induction heating by the high-frequency heating coil 2 is not performed on the welded product 5, cooling is performed more slowly. Cracks associated with cooling in the welded area e1 can be prevented.
【００２８】[0028]
【発明の効果】本発明の溶接方法によれば、ワークの溶
接時に、溶接された直後の溶接済領域を高周波加熱コイ
ルを用いてワークの溶融温度より低い温度に制御しつつ
誘導加熱する。このため、本発明の溶接方法の場合に
は、溶接された直後の溶接済領域に前記従来の場合のよ
うに制御が困難な熱風を噴射することなく、前記誘導加
熱によって冷却温度を適切な温度に制御することおよび
加熱範囲（ワークの表面より所定の深さまでの加熱）を
制御することが容易にでき、かつ前記冷却温度の制御を
施すことによって冷却に伴う割れを防止でき、製品の品
質および歩留りを向上できる。According to the welding method of the present invention, when welding a workpiece, induction heating is performed while controlling the welded area immediately after welding to a temperature lower than the melting temperature of the workpiece by using a high-frequency heating coil. For this reason, in the case of the welding method of the present invention, the cooling temperature is adjusted to an appropriate temperature by the induction heating without injecting hot air that is difficult to control as in the conventional case to the welded area immediately after welding. And the heating range (heating from the surface of the work to a predetermined depth) can be easily controlled, and by controlling the cooling temperature, cracks due to cooling can be prevented. The yield can be improved.
【００２９】また、前記本発明の溶接方法は、高周波加
熱コイルの孔内に溶接対象とするワークを配置して溶接
を施すものであり、ワークの大きさや、形状などに限定
されにくく、さらに誘導加熱によって溶接された直後の
溶接済領域の冷却温度の制御をすることができるため、
種々の形状、材質のワークを溶接する場合に適用でき、
利用範囲が広い。In the welding method of the present invention, a work to be welded is placed in a hole of a high-frequency heating coil and welding is performed. Because it is possible to control the cooling temperature of the welded area immediately after welding by heating,
Applicable when welding workpieces of various shapes and materials,
Wide range of use.
【図１】実施例１の溶接方法で用いる溶接対象として用
いる略筒状のワークと、ワークの外周側で同軸的に配置
された高周波加熱コイルとの位置関係を示すとともに、
それらを軸方向の一端から視認した概略図。FIG. 1 shows a positional relationship between a substantially cylindrical workpiece used as a welding target used in a welding method according to a first embodiment and a high-frequency heating coil arranged coaxially on the outer peripheral side of the workpiece;
The schematic diagram which recognized them from one end of the axial direction.
【図２】図１におけるＢーＢ矢視線断面位置におけるワ
ークの溶接対象部分と、溶接トーチとの位置関係を示す
概略図。FIG. 2 is a schematic diagram showing a positional relationship between a welding target portion of the work and a welding torch at a cross-sectional position taken along line BB in FIG.
【図３】図２におけるワークの溶接対象部分が溶接され
た後の状態を示す概略図。FIG. 3 is a schematic view showing a state after a welding target portion of the work in FIG. 2 has been welded;
【図４】実施例１の溶接方法における高周波加熱コイル
によるワークの温度変化（溶接トーチによるアークの発
生していない部分での温度変化）および溶接開始と誘導
加熱開始、溶接終了と誘導加熱終了とを示すとともに、
横軸に時間経過を示し、縦軸にワークの温度変化を示す
説明図。FIG. 4 shows a temperature change of a workpiece by a high-frequency heating coil (a temperature change in a portion where an arc is not generated by a welding torch), a welding start and an induction heating start, a welding end and an induction heating end in the welding method of the first embodiment. Along with
FIG. 4 is an explanatory diagram showing a lapse of time on a horizontal axis and a temperature change of a work on a vertical axis.
【図５】実施例２の溶接方法における高周波加熱コイル
によるワークの温度変化（溶接トーチによるアークの発
生していない部分での温度変化）および溶接開始と誘導
加熱開始、溶接終了と誘導加熱終了とを示すとともに、
横軸に時間経過を示し、縦軸にワークの温度変化を示す
説明図。FIG. 5 shows a change in temperature of a workpiece by a high-frequency heating coil (temperature change in a portion where an arc is not generated by a welding torch), a start of welding and a start of induction heating, and a end of welding and an end of induction heating in the welding method of Example 2. Along with
FIG. 4 is an explanatory diagram showing a lapse of time on a horizontal axis and a temperature change of a work on a vertical axis.
１…溶接トーチ ２…高周波加熱コイル ３…円筒
４…筒状体 ５ａ…組付け体 ５…溶接済製品 ｅ…溶接対象領域 ｅ１…溶接済領域1: welding torch 2: high frequency heating coil 3: cylinder
4: cylindrical body 5a: assembled body 5: welded product e: welding target area e1: welded area
Claims (1)
済領域を高周波加熱コイルを用いて該ワークの溶融温度
より低い温度に制御しつつ誘導加熱することを特徴とす
る溶接方法。1. A welding method, wherein when a workpiece is welded, induction heating is performed while controlling a welded area immediately after welding to a temperature lower than a melting temperature of the workpiece by using a high-frequency heating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9207855A JPH1147974A (en) | 1997-08-01 | 1997-08-01 | Welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9207855A JPH1147974A (en) | 1997-08-01 | 1997-08-01 | Welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1147974A true JPH1147974A (en) | 1999-02-23 |
Family
ID=16546657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9207855A Pending JPH1147974A (en) | 1997-08-01 | 1997-08-01 | Welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1147974A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302065A (en) * | 2022-08-05 | 2022-11-08 | 燕山大学 | Efficient heating device and method |
| CN115846920A (en) * | 2022-11-28 | 2023-03-28 | 厦门海辰储能科技股份有限公司 | Welding method of battery sealing nail |
-
1997
- 1997-08-01 JP JP9207855A patent/JPH1147974A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302065A (en) * | 2022-08-05 | 2022-11-08 | 燕山大学 | Efficient heating device and method |
| CN115302065B (en) * | 2022-08-05 | 2023-09-26 | 燕山大学 | Efficient heating device and method |
| CN115846920A (en) * | 2022-11-28 | 2023-03-28 | 厦门海辰储能科技股份有限公司 | Welding method of battery sealing nail |
| CN115846920B (en) * | 2022-11-28 | 2024-01-26 | 厦门海辰储能科技股份有限公司 | Welding method of battery sealing nail |
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